short time, Offa succeeded in restoring the ecclesiastical unity of Mercia, while adding East Anglia to it. Under his influence, the Synod of Chelsea in 787 established an Archbishopric of Lichfield, headed by Higbert, the existing bishop. This arrangement did not long survive Offa himself, and the various dioceses were returned to their original provinces in 803. The Danelaw In 867, under Ivar the Boneless, the Danes captured Nottingham. Despite attempts by King Æthelred of Wessex and his brother, Alfred, the Danes remained, establishing Nottingham as one of the five Burghs of the Danelaw. Marching from Lindsey to Repton in 874, Ivar drove Burgred from his kingdom, bringing Norse paganism with him. The north of Mercia remained under pagan influence until Ivar’s successor, Guthrum, converted to Christianity at the Treaty of Wedmore in 878. References Religion Anglo-Saxon paganism Christianity in Anglo-Saxon England